反应详情

温度

100 °C

Five grams of dihydro-1H-pyrrolizine-3,5(2H,6H)-dione (III) are dissolved in 27 g of p-methylbenzyl alcohol and 0.2 ml of concentrated hydrochloric acid is added. The solution is heated at 100° C. for 48 hours. The mixture is cooled and chromatographed over silica gel in dichloromethane. The starting p-methylbenzyl alcohol is eluted with dichloromethane and the product is eluted with 1.0% methanol in dichloromethane. The eluate containing the product is concentrated at reduced pressure and the residual oil solidifies upon standing. The solid is recrystallized from toluene-diethyl ether to yield 5-oxo-2-pyrrolidinepropanoic acid p-methylbenzyl ester with a melting point of 71°-72° C.

1. temperatureThe mixture is cooled
2. customchromatographed over silica gel in dichloromethane
3. washThe starting p-methylbenzyl alcohol is eluted with dichloromethane
4. washthe product is eluted with 1.0% methanol in dichloromethane
5. additionThe eluate containing the product
6. concentrationis concentrated at reduced pressure
7. customThe solid is recrystallized from toluene-diethyl ether